electromagnetic wave absorp-tion at radar frequencies

ROHACELL® EC

ROHACELL® EC is a conductive, closed-cell foam specifically designed for stealth applications, including use in stealth aircraft and electromagnetic shielding.

ROHACELL® EC features all the exceptional thermomechanical properties and strength-to-weight ratios found in traditional ROHACELL® foam, but provides the added benefits of superior dielectric properties and absorption of electromagnetic waves at radar frequencies. 

This unique combination of properties is the result of loading the ROHACELL® polymer with carbon particles during processing - making it an excellent sandwich core solution for components requiring both radar absorption properties and superior mechanical performance.

Dielectric properties

Frequency [GHz]

ROHACELL® 71 EC

ROHACELL® 150 EC

Real part of permittivity

5

1.44

1.83

10

1.33

1.62

20

1.25

1.68

30

1.28

1.52

Imaginary part of permittivity

5

0.18

0.41

10

0.12

0.30

20

0.14

0.24

30

0.10

0.20

Scattering Parameters determined using transmission/ reflection/ method (waveguide and Vector Network Analyzer).

Permittivity determined using Nicholson Ross Weir algorithm.

Single measurement based values.

Efficient Processing

ROHACELL® EC can withstand the most demanding curing and processing conditions up to 180°C and 7 bars depending on material density. It is compatible with all common curing processes including vacuum infusion, resin transfer molding, pre-preg autoclaving, as well as hand lay-up.

Notice : Evonik is aware of its product responsibility to the global community and takes reasonable care in the distribution of its products. ROHACELL® EC purchase and usage may require a license and proof of end user application. This product is:

  • Subject to EEC regulation 428/2009 (Dual Use Regulation) annex I 1C101
  • Subject to EEC regulation 1334/2000 annex IV, a EEC domestic export license is required

NOTE : United States customers purchasing from a US supplier are not subject to the above listed EEC regulations.

Sales range for ROHACELL® EC (mm)

ROHACELL®
Size [mm]
71 EC
1016 x 584 x 45
150 EC
1016 x 584 x 40

Thickness tolerance +/- 0.5 mm

Sales range for ROHACELL® EC (inch)

ROHACELL®
Size [inch]
71 EC
40 x 23 x 1.75
150 EC
40 x 23 x 1.50

Thickness tolerance +/- 0.02 inch

All dimension ranges presented in these tables are standard. To discuss any size or thickness not listed, please contact a ROHACELL® representative.